:root {
  color-scheme: light;
  font-family: system-ui, "PingFang SC", "Microsoft YaHei", sans-serif;
  color: #242a33;
  background: #fff;
  font-synthesis: none;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  padding: 32px;
  -webkit-font-smoothing: antialiased;
}
main {
  width: min(100%, 640px);
  margin: auto;
  padding: 64px 0;
}
h1 {
  margin: 0 0 24px;
  font-size: clamp(36px, 7vw, 56px);
  font-weight: 600;
  letter-spacing: -1.5px;
  overflow-wrap: anywhere;
}
p { line-height: 1.9; }
.intro { font-size: 18px; margin: 0 0 12px; }
.note { color: #737b87; font-size: 14px; margin: 0; }
footer { text-align: center; color: #9298a1; font-size: 12px; }